Thoroughly rinse spinach, pat dry ... orange segments, mushrooms, croutons and sunflower seeds. Combine dressing ingredients (oil, vinegar, paprika, ketchup, ... or two before using.
Scatter croutons in 9 inch quiche pan ... seasonings. Microwave uncovered on high for 3 1/2 to 4 1/2 minutes. Spoon dressing on top. Let stand 5 minutes.